Adjustment of display brigthness not possible

[Stefan]

when I try to adjust the display brightness using the specific keys or try to change the brigthness through the Settings in menu, nothing happens

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-96-generic 4.4.0-96.119
ProcVersionSignature: Ubuntu 4.4.0-96.119-generic 4.4.83
Uname: Linux 4.4.0-96-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia wl
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: stefan 1932 F.... pulseaudio
 /dev/snd/controlC1: stefan 1932 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Oct 13 16:32:21 2017
HibernationDevice: RESUME=UUID=6fe9bb0a-4db3-4413-a1ff-366e4e7a6943
InstallationDate: Installed on 2016-09-17 (390 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: LENOVO 20252
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-96-generic.efi.signed root=UUID=2a52664a-c612-4887-9fe2-72ae2ea930a8 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-96-generic N/A
 linux-backports-modules-4.4.0-96-generic N/A
 linux-firmware 1.157.12
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/29/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 8ECN94WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Ginkgo 7A1
dmi.board.vendor: LENOVO
dmi.board.version: 31900058Std
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G710
dmi.modalias: dmi:bvnLENOVO:bvr8ECN94WW:bd04/29/2014:svnLENOVO:pn20252:pvrLenovoG710:rvnLENOVO:rnGinkgo7A1:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoG710:
dmi.product.name: 20252
dmi.product.version: Lenovo G710
dmi.sys.vendor: LENOVO

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.